To do Alt + H O P on Mac in Excel, download and install Accelerator Keys, then press Option, followed by H, O, and P.
Command: Protect Sheet
This is how to do Alt + H O P on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + H O P opens the Protect Sheet dialog, allowing you to prevent unwanted changes to the worksheet. You can set a password and choose which actions users are allowed to perform on protected cells, such as selecting cells, formatting, or inserting rows.